llvm-project/clang/test/Analysis/malloc.mm

// RUN: %clang_cc1 -analyze -analyzer-checker=core,unix.Malloc -analyzer-store=region -verify %s
#include "system-header-simulator-objc.h"

typedef __typeof(sizeof(int)) size_t;
void *malloc(size_t);
void free(void *);

// Done with headers. Start testing.
void testNSDatafFreeWhenDoneNoError(NSUInteger dataLength) {
  unsigned char *data = (unsigned char *)malloc(42);
  NSData *nsdata = [NSData dataWithBytesNoCopy:data length:dataLength];
  free(data); // no warning
}

void testNSDataFreeWhenDoneYES(NSUInteger dataLength) {
  unsigned char *data = (unsigned char *)malloc(42);
  NSData *nsdata = [NSData dataWithBytesNoCopy:data length:dataLength freeWhenDone:1]; // no-warning
}

void testNSDataFreeWhenDoneYES2(NSUInteger dataLength) {
  unsigned char *data = (unsigned char *)malloc(42);
  NSData *nsdata = [[NSData alloc] initWithBytesNoCopy:data length:dataLength freeWhenDone:1]; // no-warning
}


void testNSStringFreeWhenDoneYES(NSUInteger dataLength) {
  unsigned char *data = (unsigned char *)malloc(42);
  NSString *nsstr = [[NSString alloc] initWithBytesNoCopy:data length:dataLength encoding:NSUTF8StringEncoding freeWhenDone:1]; // no-warning
}

void testNSStringFreeWhenDoneYES2(NSUInteger dataLength) {
  unichar *data = (unichar*)malloc(42);
  NSString *nsstr = [[NSString alloc] initWithCharactersNoCopy:data length:dataLength freeWhenDone:1]; // no-warning
}


void testNSDataFreeWhenDoneNO(NSUInteger dataLength) {
  unsigned char *data = (unsigned char *)malloc(42);
  NSData *nsdata = [NSData dataWithBytesNoCopy:data length:dataLength freeWhenDone:0]; // expected-warning{{leak}}
}

void testNSDataFreeWhenDoneNO2(NSUInteger dataLength) {
  unsigned char *data = (unsigned char *)malloc(42);
  NSData *nsdata = [[NSData alloc] initWithBytesNoCopy:data length:dataLength freeWhenDone:0]; // expected-warning{{leak}}
}


void testNSStringFreeWhenDoneNO(NSUInteger dataLength) {
  unsigned char *data = (unsigned char *)malloc(42);
  NSString *nsstr = [[NSString alloc] initWithBytesNoCopy:data length:dataLength encoding:NSUTF8StringEncoding freeWhenDone:0]; // expected-warning{{leak}}
}

void testNSStringFreeWhenDoneNO2(NSUInteger dataLength) {
  unichar *data = (unichar*)malloc(42);
  NSString *nsstr = [[NSString alloc] initWithCharactersNoCopy:data length:dataLength freeWhenDone:0]; // expected-warning{{leak}}
}

// TODO: False Negative.
void testNSDatafFreeWhenDoneFN(NSUInteger dataLength) {
  unsigned char *data = (unsigned char *)malloc(42);
  NSData *nsdata = [NSData dataWithBytesNoCopy:data length:dataLength freeWhenDone:1];
  free(data); // false negative
}

// Test CF/NS...NoCopy. PR12100: Pointers can escape when custom deallocators are provided.
void testNSDatafFreeWhenDone(NSUInteger dataLength) {
  CFStringRef str;
  char *bytes = (char*)malloc(12);
  str = CFStringCreateWithCStringNoCopy(0, bytes, NSNEXTSTEPStringEncoding, 0); // no warning
  CFRelease(str); // default allocator also frees bytes
}

void stringWithExternalContentsExample(void) {
#define BufferSize 1000
    CFMutableStringRef mutStr;
    UniChar *myBuffer;
 
    myBuffer = (UniChar *)malloc(BufferSize * sizeof(UniChar));
 
    mutStr = CFStringCreateMutableWithExternalCharactersNoCopy(0, myBuffer, 0, BufferSize, kCFAllocatorNull); // expected-warning{{leak}}
 
    CFRelease(mutStr);
    //free(myBuffer);
}

// PR12101 : pointers can escape through custom deallocators set on creation of a container.
void TestCallbackReleasesMemory(CFDictionaryKeyCallBacks keyCallbacks) {
  void *key = malloc(12);
  void *val = malloc(12);
  CFMutableDictionaryRef x = CFDictionaryCreateMutable(kCFAllocatorDefault, 0, &keyCallbacks, &kCFTypeDictionaryValueCallBacks);
  CFDictionarySetValue(x, key, val); 
  return;// no-warning
}

NSData *radar10976702() {
  void *bytes = malloc(10);
  return [NSData dataWithBytesNoCopy:bytes length:10]; // no-warning
}